Uptrends is perfect for site monitoring.

Pros

The interface and backoffice are intuitive and easy to use. You can simply expand on your initial setup. The solution is stable.

Cons

The filtering of the uptrends traffic from Google Analytics can take some time and needs to be reviewed periodically.

Good Monitoring Software

It was good. There was a learning curve but customer service was eager to help.

Pros

The setup was easy and the customer service was helpful when I first set it up. The software is well supported.

Cons

The notifications had to be adjusted to get the emails I wanted to receive. Not an issue but had to learn the system.

Incredibly powerful website monitoring

Uptrends offer some truly powerful monitoring tools for a fair price. It's one of the few services I've found that offers a waterfall interval check. This lets you keep track of how each of your pages is performing/loading and lets you identify where any slowdowns might be. The interface wasn't as easy to use as I would have liked, but support is readily available and happy to help set things up or change them. This is one of the few companies where I've actually have the chance to talk with the owner. He's very helpful and passionate about Uptrends.

Pros

Uptrends can help you monitor aspects of your site that most services simply can't.

Cons

The backend usability could be improved.

Beware of this Company!

Pros

It pinged our web site every 5 minutes, and it was easy to use, but i'll never use it again.

Cons

We used this service for several years, and were never set up on Auto-Pay. My boss paid it using a credit card each year. Then she left, and when the rep couldn't get in touch with her, he switched our account to Auto Pay. If you're on Auto Pay, and you don't cancel within 90 days, they charge you for the whole year. I tried to dispute it, even messaged the reps boss and she didn't reply. They just sent us to collections.

Acceptable functionality, scammy business practices

Pros

It does its job of monitoring, albeit with a clunky 90s-era interface.

Cons

First, their UI makes it impossible to downgrade plans . You can only upgrade. Nice. Then, their "month to month" billing is a scam. In the fine print, you have to give them 3 months' notice (!) Who does that... And they conveniently interpreted "3 months" as "4 more payments". I.e., I cancelled in mid-June, and I'm charged at the end of June, the end of July, the end of August, and the end of September. Great! Then... they don't stop charging your card even after the ridiculous 3 months have passed ... *Another* charge comes in at the end of October. Don't fall for it like we did... Use something else like dotcom-monitor.com (which is recommended in Google Page Speed docs) -- just anything else than these guys.